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NBR technique (Natural Background Rejection) for
detection of lowest artificial gamma radiation
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The NBR technique (Natural Background Reduction) allows the
detection of even the smallest amounts of artificial gamma radiation in the presence of
fluctuating natural radiation background fields. In the case of the process developed by
ESM, the average energy and the distribution of the gamma radiation are monitored
continuously and irregularities detected in fractions of a second. This means: high
statistical certainty and - even in the case of well shielded sources - extremely short
measuring times.
Features
- Compensation of natural fluctuations
- Spectroscopic Compensation of shielding effects (e.g. by the passing vehicle). Even
sources that are so well shielded that they do not even lead to an increased detector
signal compared to normal background can be detected.
- Distinguishes between natural effects (e.g. fertiliser, bricks,...) and artificial
radiation from e.g. hidden sources....
- In the case of shielded sources this method is better than precise spectroscopy because
the main part of the radiation arrives scattered and therefore with modified energies.
Typical applications:
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